Lock-nut.



W. J. TOLLERTON.

LOCK NUT.

APPLICATION FILED APR. 10, 1914.

Patented July 28, 191i WILLIAM J'. TOLLER'ION, OF CHICAGO, ILLINOIS.

Specification of Letters Patent.

Patented til 28, Kittie.

Application filed April 10, 1914. Serial No. 830,890.

To all whom it may concern:

Be it known that I, WILLIAM J. TOLLER- TON, a citizen of the United States, and a resident of Chicago, county of Cook, State of Illinois, have invented certain new and useful Improvements in Lock-Nuts, of which the following is a full, clear, and exact de scription.

The improvement relates to lock nutsand seeks to provide a simple, inexpensive form which, when threaded on the nut and forced against an abutting face or part, will be securely held in place.

The invention consists in the features of improvement hereinafter set forth, and more particularly pointed out in the appended claims. I I

In the drawings, Figure l is a plan view of the improved lock nut mounted on a bolt. Fig. 2 is a view in elevation showingthe nut in position when it first engages the face or the part through which the bolt extends. Fig. 3 is a similar view showing the nut still further forced to place against the part or abutment about the bolt. Fig. 4: is a plan view showing a nut of slightly different form. Fig. 5 is a view in elevation of the nut shown in Fig. 4.

The improved nut is of simple form and may be of any suitable polygonal outline. The nut (1, shown in Figs. 1, 2 and 3, is hexagonal, while the nut a shown in Figs. 4. and 5 is square.

The improved nut, as shown in Figs. 2, 3 and 5, is S-shaped in section and its opposite abutting faces are preferably reversely curved, the form being such that each abutting face is provided with a projecting, beveled or wedge-shaped edge 1 and with a protuberant, rounded, contacting portion 2. The nut may be conveniently formed in quantity from a metal bar which is rolled orotherwise suitably formed, so that it is correspondingly S-shaped in cross-section.

The nut is tapped at a slight angle to the, normal line extendingthrou'gh the" center of the nut. In Fig. 5, the line a:m represents the axis of the tapped opening 3 of the nut, and, as shown, is at a slight angle to. the normal line yz This angle is suchthat the beveled or wedge-shaped edges l'pr'oject beyond the rounded contacting portions 2. That is to say, if line's ov are drawn tangent to the, rounded contacting portions 2 and at right anglesto the axis w-w, the beveled edges 1 will project slightly beyond these lines, as indicated in Fig. I

Then the nut is threaded on the bolt 5 agalnst a. part or abutment 0, through which the bolt extends, the wedge-shaped edge 1 of the inner .face of the nut will first engage the outer face of the part or abutmentc, as shown in Fig. 2. The continued turning of the nut will produce a slight distortion thereof and of its threads, and will bring the rounded contacting portion into engage ment with the surface of the abutment c and at the same time, the wedge-shaped edge 1 will cut into the surface of the part 0. The'rounded contacting portion, after it engages the face of the part 0 is still free to revolve and will not, of course, cut this surface. This arrangement enables all the force applied in turning up the nut to be devoted to forcing the single wedge-shaped edge 1 into the surface, and also in taking nut or distorting it, so that the nut is securely ambed against the face of the abutment or part c and upon the threads of the bolt. This provision of the contacting portion and the wedge-shaped edge which cooperate to distort the nut and force the wedge into the abutting surface, is distinctive of thepresent improved lock nut.

It'is obvious that the improved lock nut may be employed in connection with an orldifliary nut'which is first threaded on the Changes may 'be'made in the details set forth without departure from the essentials of the invention as defined in the claims.

I claim as my invention:---

1. A lock-nutflhavin'g its abutting face shaped to form a beveled edge and a rounded contacting portion onopposite sides of the axis of the nut, said edge being arranged to engage the face against which the nut is forced-before the latter is engaged-by said rounded contacting portion, substantially as described. v

2. A look nut S-shaped in section andhaving its opposite faces each provided with a projecting beveled edge and a protuberant contacting portion on opposite sides of the axis of the nut, said edge and said contacting portion being arranged to successively engage the face against which the nut is forced,substantially as described.

3. A lock nut S-shaped in section and the camber or curve out of the bottom of the sis - having reversely curved abutting faces, each provided with a beveled edge and a rounded contacting portion on opposite sides of the axis of the nut, said nut being tapped at a slight angle to the normal line passing through the center of the nut, substantially as described.

4. A lock nut S-shaped in section and having reversely curved abutting faces, each provided with a beveled edge and a rounded contacting portion on opposite skies of the 

